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(Circulation. 1996;93:567-576.)
© 1996 American Heart Association, Inc.

Articles

Accurate Three-Dimensional Reconstruction of Intravascular Ultrasound Data

Spatially Correct Three-Dimensional Reconstructions

James L. Evans, MD; Kok-Hwee Ng, MSEE; Stephen G. Wiet, MD; Michael J. Vonesh, MSEE; William B. Burns, MD; Martin G. Radvany, MD; Bonnie J. Kane, BS; Charles J. Davidson, MD; Sanford I. Roth, MD; Barry L. Kramer, MD; Sheridan N. Meyers, MD; David D. McPherson, MD

From the Departments of Medicine and Pathology, Northwestern University Medical School, Chicago, Ill.

Background The geometrical accuracy of conventional three-dimensional (3D) reconstruction methods for intravascular ultrasound (IVUS) data (coronary and peripheral) is hampered by the inability to register spatial image orientation and by respiratory and cardiac motion. The objective of this work was the development of improved IVUS reconstruction techniques.

Methods and Results We developed a 3D position registration method that identifies the spatial coordinates of an in situ IVUS catheter by use of simultaneous ECG-gated biplane digital cinefluoroscopy. To minimize distortion, coordinates underwent pincushion correction and were referenced to a standardized calibration cube. Gated IVUS data were acquired digitally, and the spatial locations of the imaging planes were matched to their corresponding coordinates. Image points were then transformed relative to their respective 3D coordinates, rendered in binary voxel format, resliced, and displayed on an image-processing workstation for off-line analysis. The method was tested by use of phantoms (straight tube, 360° circle, 240° spiral) and an in vitro coronary artery model. In vivo feasibility was assessed in patients who underwent routine interventional coronary procedures accompanied by IVUS evaluation. Actual versus calculated point locations were within 1.0±0.3 mm of each other (n=39). Calculated phantom volumes were within 4% of actual volumes. Phantom 3D reconstruction appropriately demonstrated complex morphology. Initial patient evaluation demonstrated method feasibility as well as errors if respiratory and ECG gating were not used.

Conclusions These preliminary data support the use of this new method of 3D reconstruction of vascular structures with use of combined vascular ultrasound data and simultaneous ECG-gated biplane cinefluoroscopy.

Key Words: ultrasonics • coronary disease • imaging

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